Fireproof insulating-duct.



No. 672,07l. Patented Apr. l6, I90I.

H. N. &. E. D. SPEER.

FIREPROUF INSULATING DUCT.

(Application filed Sept. 8, 1900.) (No Modej.)

THE uonms PETERS 00v. PNGTOLITHOH wnsnmmtm. n. c.

FFICE.

UNITED STATES ATENT HORACE N. SPEER AND EDWARD D. SPEER, OF NEW YORK, N. Y., ASSIGNORS TO THE SECURITY CONDUIT COMPANY, OF SAME PLACE.

FIREPROOF INSULATING-DUCT.

SPEGIFICATION' formingpart of Letters Patent No. 672,071, dated April 16, 19011..

Application filed September 8, 1900. Serial No. 29,430. (No model.)

To all whom it may concern.- we refer to the drawings which accompany 5o Beit known that we, HORACE N. SPEER and the specification, and wheref EDWARD D. SPEER, citizens of the United Figure 1 isa broken longitudinal section of States of America, and residents of the city of the preferred construction of our invention.

New York, borough of Manhattan, and State Fig. 2 is a cross-section, and Fig. Sis a broken of New York, have invented certain new and elevation, of the same. Fig. 4 is a cross-secusefullmprovements in Fireproof Insulating tion,and Fig.5 is a broken elevation,of a modi- Ducts, of which the following is a specificafied construction. tion. Referring to Figs. 1, 2, and 3, a tube a, of

to Our invention relates to improvements in suitable material which can be saturated, as

fireproof insu1ating-ducts,and especiallysuch cotton yarn, is first formed of any desired ducts as are intended for electric wires. length. This tube is readily made by weav- It is the object of our invention to provide ing it on the machines now used for weaving a duct that shall be fireproof and waterproof, hose, and we prefer to saturate the yarn with 15 while easily and cheaply constructed,and that the fireproofing solution before weaving.

shall have sufficient flexibility to permit of its After saturation the yarn is dried and then being bent around corners and turns and carwoven into a tube. Of course, instead of satried into all the places where electric-light urating the yarn before weaving, the tube can and other wires are placed. be first woven and then saturated.

20 The need of a practically absolutely fire Any suitable solution for fireproofing purand water proof insulation for electric wires poses can be used to saturate the yarn or tube which shall be at once cheap and easily made a; but we prefer to use the following, although and applied is very great. Such insulations we do not wish to limit our invention to the as are now employed are far from being fireuse of any particular fireproofing solution 2 5 proof, and their use increases danger of fire viz., two ounces (avoirdupois) of phosphate of from the presence of the wires. It is also necammonia to one quart of water. 7 5 essary that in addition to being fireproof the After the tube a is completed a coating 1) of insulation shall be waterproof, for if it is not any suitable waterproofing solution or paintit soon deteriorates under the exposure to as, for instance, dissolved rubber gum-is o moisture which is inevitable in the use of inapplied, which also acts as a cement to fasten sulators, and becomes worthless. the outer layer or tube 0 firmly to the inner 8o Essentially, our improved insulator contube a. If rubber gum is used, We prefer to sists of a plurality of layers of a fabric or mavulcanize tubes a and 0 together. Said outer terial which will absorb a suitable fireprooftube a is made in the same manner as said 35 ing solutionsuch a fabric, for example, as tube a, but of a size to fit snugly over the latwoven cotton hose, cloth, or paper wound ter and its coat of waterproofing, and we preinto a tube. The layers are each saturated for to saturate the yarn of which the tube 0 with a suitable fireproofing solution and are is to be Woven with the said fireproofing soluseparated bya layer of some waterproof subtion before tube 0 is woven, although, of

40 stance, as rubber. Outside of all is also a course, said tube 0 may be first woven and layer of waterproofing substance, which may then saturated. After tube 0 is placed over 0 also preferably be fireproof. tube a we apply a coat of any of the pigments A duct made as above described is practiknown in the trade as fireproof paints, and cally absolutely fireproof. Even a powerful which are both fire and waterproof, or we 45 electric arc in the duct cannot ignite it and may employ a coat simply of waterproofing cause it to burst into flame, and the watersubstance, as a solution of rubber. proof coating renders it practically indestruc- Instead of applying the fireproof paint to tible by the weather. the tube 0 after said tube is woven we may To more clearly exhibit the construction, saturate the yarn of which said tube is to be Woven after the said yarn has been saturated with the fireproofing solution and dried, as above described. We may also apply said fireproof paint as well to the inner tube a as to the outer tube 0.

Referring to Figs. 4 and 5, the duct is made by rolling any suitable fabric e, as cotton cloth, into a tube with a plurality of spiral layers. Before being rolled the cloth is saturated with the aforesaid fireproofing solution and dried and is then coated on both sides with any suitable waterproofing substance, as dissolved rubber gum. The fabric is then formed into a tube by rolling on a mandrel While the gum is still soft and sticky, whereby the gum cements all the layers together. We then vulcanize the rubber, and the duct is ready for use, or it may be coated with fireproof paint, as above described.

Now, having described our improvements, we claim as our invention HORACE N. SPEER. EDWARD D. SPEER.

Witnesses:

BERNARD J. IsEoKE, HENRY V. BROWN. 

